SCRIPT ERROR: citizen:/scripting/lua/scheduler.lua:867: table index is nil

[novahaxor]

[ c-scripting-core] Creating script environments for ef-phone
[ script:ef-phone] SCRIPT ERROR: citizen:/scripting/lua/scheduler.lua:867: table index is nil
[ script:ef-phone] > fn (@ef-phone/server/main.lua:1)
[ resources] Started resource ef-phone

[novahaxor]

after adding local QBCore = exports['qb-core']:GetCoreObject() to the client and server it has fixed but now im stuck with the phone opening with no apps

SCRIPT ERROR: @ef-phone/server/main.lua:1091: attempt to concatenate a nil value (field 'pings')

[Alicopower]

Does anyone know how to resolve this error:
SCRIPT ERROR: @ef-phone/server/main.lua:1091: attempt to concatenate a null value (field 'pings')

What could I be doing wrong?